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Compare Floating Numbers in Python

Compare two floating-point numbers with a tolerance to avoid precision issues.

IntermediateConditional ProgramsExample 15 of 20
compare-floating-numbers.py
1# Program to compare two floating-point numbers
2

3import math
4

5a = float(input("Enter first float: "))
6b = float(input("Enter second float: "))
7epsilon = 1e-9
8

9if math.isclose(a, b, rel_tol=0.0, abs_tol=epsilon):
10    print("Numbers are approximately equal")
11elif a > b:
12    print("First number is greater")
13else:
14    print("Second number is greater")

Output

Enter first float: 0.1
Enter second float: 0.1
Numbers are approximately equal

What's going on

Due to floating-point precision, direct equality checks can be unreliable.

We use math.isclose() with a small absolute tolerance to decide equality before comparing magnitude.

After this program

If the idea is still fuzzy, read Day 8: Conditional Statements in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 20 conditional programs, or see every topic on Python exercises.

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